Carburetor



G. F. KEY.

CARBURETOR. APPLICATION FILED MAY 21 1920.

Patented Mar. 21, 1922. 2 SHEETS-SHEET L I Swuemto 6250770 7 0466? G. F. KEY.

CARBURETOR.

APPLICATION FILED MAYZZ, 1920.

Patented Mar. 21, 1922.

2 SHEETS-SHEET 2.

- um/"to l 620272 F3 I UNITED STATES PATENT OFFICE.

GEORGE FOSTER KEY, OF DETROIT, MICHIGAN.

GARBURETOR.

' Application filed May 27,

To all whom it may concern:

Be it known that I, G-nonon Fos'rnn Ker, a citizen of the United States of America, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Carburetors, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to carburetors for internal combustion engines.

It is a well known fact that such engines are, as a rule, required to run at varying speeds and under varying loads, and that the quantity and proportions of air and liquid fuel energizing the engine must be correspondingly varied to secure maximum efficiency of operation. It is also well known that full compression of the charge is essential for the best explosion, that is to say, the most complete combustion of said charge, and a minimum residue of carbon.

The present invention seeks to insure a full charge and hence a full compression for every explosion of the engine. The invention further seeks to deliver to the air current passing through the carburetor a definite volume of liquid fuel for each explosion of the engine, and to provide for regulation of said volume according to the load and desired speed. By attainment of these objects, the maintenance of a substantially uniform ratio between the amount of liquid fuel delivered to the engine and the energy derived from the latter will be accomplished.

In attaining the aforesaid objects, the invention contemplates the employment in a carburetor of a metering wheel driven in a positively timed relation to the operation of the engine, and peripherally formed with a series of pockets which, as said. wheel rotates, successively deliver known volumesof liquid fuel from a suitable supply chamber to the mixing chamber of the carburetor, the timing of the wheel with respect to the engine insuring uniformity of the mixture under constant operating conditions, and means being provided for simultaneously and cor Specification of Letters Patent, Patg t d pl 21 1922 1920. Serial no. 384,547.

rcspondingly varying the size of the meter mg pockets to compensate for any change in the operating conditions.

A preferred embodiment of the invention is described in the following specification and illustrated in: the accompanying drawings, wherein:

' Figure l is a plan view of the improved carburetor;

Figure 2 is a view of the same in sectional elevation;

Figure 3 is a horizontal sectional view of the same; 7

Figure l is a vertical sectional view trans verse to that of Figure l.

in these views the reference characters 1 and 2 respectively designate the upper and lower halves of a cylindrical casing, said halves being secured together by screws 2. The members 1 and 2 also jointly form a portion 3 of a relatively small cylindrical casing, arranged coaXially with the first mentioned casing, and lying partially within the same. An exterior portion i of the small casing is formed jointly by the halves of the larger casing and projects as a hub from one side of said larger casing. 'lhe member 1 interiorly forms a liquid fuel supply chamber 5, there being an inlet 6 to said chamber at the top thereof. Any suitable means may be employed to replenish said chamber atsuitable intervals. The lower member 2 interiorly forms a mixing chamber 7, which extends arcuately below the smaller casing 3 and has at one end the air inlet 7* and a mixture outlet 7 at its other end. ld ithin the small casing 3, 4 there is arranged a liquid fuel metering wheel comprising two parts 8 and 9, mounted upon a shaft 10, engaging journal bearings ll, jointly formed by the members 1 and 2. The member 8 is fast upon said shaft in the portion 3 of the small casing and is peripherally formed with a plurality of shallow pockets 12, having a fixed circumferential dimension, but variable as regards their width by means of tongues 13, projecting laterally into said pockets from the member 9. The latter member is splined upon the shaft 10 so that through a sliding adjustment of said member, said tongues may he thrust more or less into the pockets .12 to vary the size thereof. To effect sliding adjustment of the member 9, a lever 14: is horizontally pivoted upon the member 1 as indicated at 15, one end of said lever being bent to form a pin 16 which projects through a slot 17 in the hub portion of the member Il. and engages in an annular groove 18 in the member 5). Thus by rocking said lever, the member 9 may be adjusted to or from the other part 8 of the metering wheel without interference with rotation of said member. At 19 is indicated an actuating rod for the lever 1%, said rod being attached to the outer end of said lever and being manually operable in any suitable manner. The shaft 10 is driven either directly by the engine or synchronously with the latter, so that the liquid fuel metering wheel is timed with relation to the explosions and delivers a definite volume of the combustible to the mixing chamber for each explosion. To admit the liquid fuel to the pockets 12, the upper half of the casing 3 is circumferentially slotted as indicated at 20. The pockets discharge their contents into the mixing chamber through an opening2l. in the lower member of said casing 3. l

The described carburetor serves to effect a correct application of the fundamental principle of carburization, namely,the positive delivery of the requisite amount of liquid fuel to an -unrestricted supply of air to constitute each charge of explosive mlxture drawn into the engine cylinders. An instant 'ariation of the supply of liquid fuel to the engine may be effected by changing the size of the pockets 12 through manipulation of the rod 19, so that the energy developed by the engine may be at all times properly proymrtioned to the load or desired speed of operation.

it is a feature of the described invention that the maintenance of a fixed and constant level of liquid fuel in the supply chamber is not necessary, so that the float chamber which is an essential of the ordinary carburetor may be eliminated. Also the invention does away with the usual needle valve, and eliminates thehtrouble which frequently arises through clogging of thesmall orifice controlled by such a valve by particles of sediment in the liquid fuel.

. What I claim as my invention is:

1. In a carburetor, the combination with liquid fuel supply chamber, of a. mixing duct, and a two part metering wheel for delivering liquid fuel from said chamber to said duct, one of said parts having liquid fuel pockets and the other having tongues engaging in said pockets and being adjustable to and from the first part to vary the size said pockets.

.2. ltn a carburetor, a liquid fuel supply chamber, a mixing duct extending beneath said supply chamber, a casing arranged in termediate said supply chamber and duct and having an outlet to the latter and an inlet from the former, a metering wheel arranged within said casing provided with pockets for transferring liquid fuel from said chamber to said duct, means for driving said metering wheel in synchronous relation with the air.

5. In a carburetor, the combination with a liquid fuel supply chamber and a mixing duct extending beneath said chamber, of a casing arranged intermediate said supply chamber and duct having an outlet to the latter and an inlet from theformer, and a metering wheel disposed within said casing provided with a pocket for transferring liquid fuel from said chamber to said duct,

and delivering the same centrifugally into" said duct, whereby the momentum imparted to the fuel by the rotative member is utilized to break up the fuelby impact with the air.

6. In a carburetor, the con'ibinationwith a liquid fuel supply chamber and a' mixing duct therebeneath having an air inlet, of a rotative member mounted intermediate said chamber and duct and adapted to witl'idraw liquid fuel from said chamber and deliver the same centrifugally into said duct, counter to the flow of air from said inlet, whereby the momentum imparted to the fuel by the rotative member is utilizedto break up the fuel by impact with the air.

7. In a carburetor, the combination with inner and outervspaced cylindrical casings, of a partition dividing the space intermediate saidcasings into upper and lower chamhers, the former functioning as a fuel chains ber, and'the latter as a mixing chamber, the mterlor casing having an intake coimnunieating with the float chamber and an outlet discharging to said mixture chamber, and a metering wheel rotatively mounted in the inner casing and provided with pockets for s utilized to break up the fuel by impact mounted centrally in said casing and pr0- vided with pockets adapted to deliver known quantities of liquid fuel from the fuel eham- 10 her to the mixing chamber when rotatively driven.

In testimony whereof I aifix my signature.

GEORGE FOSTER KEY. 

